How to go from the written act to the fact? A collectively produced source from the 13th century to the present day.

Summary L'évident et l'invisible was born from the meeting of young researchers, economists and economic historians. Reflecting on the processes of construction of the data from which each works, the authors gathered here question, together, the status of the documents they use daily to propose texts from their own scientific experience. Such a reflection is at the heart of the historians' profession and is precisely, for them, a matter of course. On the other hand, the work of criticizing and elaborating the numerical sources from which they build their reasoning and establish calculations remains mostly invisible to economists. This is why the authors of this collection share a common approach: to explain the obvious and make visible what is not obvious at first glance. The result is a collection of essays, accompanied by short introductions that situate them on an epistemological level, which reveal all the richness of this disciplinary exchange between historians and economists, which is coupled with a fruitful dialogue between generations.